Lee, congratulations, looks like you have been hit by the dreaded "No Ratings Record Found Bug" which is in my view the most persistent problem with TB2 and one that has not been fully addressed by OOTP tech support, although they claimed to have done it with the most recent patch, it hasn't totally eliminated it.
There are numerous threads on the subject, here are a few of them, which include some advice from me based on painful past experience:
"no rating record found" bug - please advise
.dat file error when opening the game
Ratingrecords bug survived
No Rating record found!!
No Rating Record Found Error
Post #2 on the last thread (111830) contains my most complete checklist of what to do when hit by this bug, but feel free to consult all the other posts as well.
There's been alot of speculation about what causes the bug, no real consensus. Based on the last couple of times it has hit me (and believe me, by now I have learned the hard way and have the game up and running in 5 minutes by simply substituting the copy or backup file), it seems to occur when you might have two copies of the game running at once. For example, I click on the icon to open the game, wait a minute, it takes awhile to load, and impatiently I click on the icon again, so based on this I would recommend you be more patient particularly if you are finding the game takes awhile to load on your computer.
If any of this advice works or doesn't work, feel free to post any follow up questions or practical advice.